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                    向导
            
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                    2_ Java语言概述
            
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                    1、基础常识
            
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                    1.1硬件（Hardware）
            
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                    1.2软件（SoftWare）
            
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                    1.2.2应用软件
            
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                    1.3Dos命令
            
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                    1.3.1常用DOS命令(command)
            
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                    1.3.2命令的分类
            
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                    3_ 计算机语言的发展迭代史
            
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                    4_ Java语言版本迭代概述
            
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                    5_ Java语言应用的领域
            
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                    6_ Java语言的特点
            
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                    1.主要特性
            
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                    2.面向对象性
            
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                    7_ Java两种核心机制
            
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                    二、开发环境的搭建（重点）
            
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                    2_ JDK的下载、安装
            
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                    1、为什么配置path环境变量？
            
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                    1.2、如何配置？
            
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                    三、第一个Java程序
            
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                    1、开发体验—HelloWorld
            
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                    1.1编写
            
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                    1.2编译
            
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                    2.常见问题的解决
            
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                    3.总结第一个程序
            
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                    四、注释与API文档
            
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                    1.注释：Comment
            
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                    2.Java API 文档
            
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                    3.良好的编程风格
            
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                    DAY02 数据类型到进制
            
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                    基本数据类型
            
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                    引用类型和基本类型的区别
            
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                    浮点数为什么不精准整数是不是精准的为什么
            
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                    强类型的好处是什么
            
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                    简要描述java中的8种数据类型
            
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                    变量的使用与类型兼容性
            
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                    变量使用时有哪些注意事项
            
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                    变量赋值的兼容机制
            
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                    什么是变量什么是常量什么是字面量
            
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                    数值字面值的默认类型是什么
            
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                    编译器对变量和常量如何区别处理
            
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        <li class="chapter " data-level="1.3.2.6" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#为什么浮点数没有变量常量区别处理">
            
                    
                    为什么浮点数没有变量常量区别处理
            
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                    数值范围从小到大的排序是什么
            
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        <li class="chapter " data-level="1.3.2.8" data-path="DAY02 回忆式笔记.html">
            
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                    自动类型提升的主要规则(数值型)
            
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        <li class="chapter " data-level="1.3.2.9" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#强制类型转换">
            
                    
                    强制类型转换
            
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        <li class="chapter " data-level="1.3.3" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#字符与字符串">
            
                    
                    字符与字符串
            
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                <a href="DAY02 回忆式笔记.html#字符型存储的究竟是什么">
            
                    
                    字符型存储的究竟是什么
            
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        <li class="chapter " data-level="1.3.3.2" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#字符串引用类型">
            
                    
                    字符串(引用类型)
            
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        <li class="chapter " data-level="1.3.3.3" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#字符串转换">
            
                    
                    字符串转换
            
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        <li class="chapter " data-level="1.3.4" data-path="DAY02 回忆式笔记.html">
            
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                    进制
            
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                <a href="DAY02 回忆式笔记.html#权值是什么各进制如何表示">
            
                    
                    权值是什么各进制如何表示
            
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                    研究16进制的意义是什么
            
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                <a href="DAY02 回忆式笔记.html#8421法实现16进制与2进制互转">
            
                    
                    8421法实现16进制与2进制互转
            
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                    什么是补码(了解)
            
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                <a href="DAY02 回忆式笔记.html#补码和-1分别解决了什么问题">
            
                    
                    补码和-1分别解决了什么问题
            
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                <a href="DAY04 回忆式笔记.html#null-和-null-的区别是什么">
            
                    
                    NULL 和 null 的区别是什么
            
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        <li class="chapter " data-level="1.5.3.2" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#什么是质数">
            
                    
                    什么是质数
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.4" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习">
            
                    
                    练习
            
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        <li class="chapter " data-level="1.5.4.1" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习1-使用while循环打印矩阵">
            
                    
                    练习1 使用while循环打印矩阵
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.2" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习2-使用do-while-循环打印矩阵">
            
                    
                    练习2 使用do while 循环打印矩阵
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.3" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习3-for循环打印矩形">
            
                    
                    练习3 for循环打印矩形
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.4" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习4-1000以内能被7整除的数的平均值">
            
                    
                    练习4 1000以内能被7整除的数的平均值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.5" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习5-for-循环嵌套打印矩阵">
            
                    
                    练习5 for 循环嵌套打印矩阵
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.6" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习6-for循环嵌套打印三角形">
            
                    
                    练习6 for循环嵌套打印三角形
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4.7" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#练习7-for循环-找质数">
            
                    
                    练习7 for循环 找质数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.5" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#作业">
            
                    
                    作业
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.5.1" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#作业1-冒泡排序">
            
                    
                    作业1 冒泡排序
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.5.2" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#作业2-等腰三角形打印控制">
            
                    
                    作业2 等腰三角形打印控制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.5.3" data-path="DAY04 回忆式笔记.html">
            
                <a href="DAY04 回忆式笔记.html#作业3-求1000以内质数的平均值">
            
                    
                    作业3 求1000以内质数的平均值
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#day05-回忆式笔记">
            
                    
                    DAY05 回忆式笔记
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#死循环问题">
            
                    
                    死循环问题
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#while语句死循环">
            
                    
                    while语句死循环
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.1.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#for语句死循环">
            
                    
                    for语句死循环
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.1.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#像但不是死循环">
            
                    
                    像但不是死循环
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#循环的特殊流程控制">
            
                    
                    循环的特殊流程控制
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.2.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#break-语句">
            
                    
                    break 语句
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#循环的标签与break联合">
            
                    
                    循环的标签与break联合
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#场景回顾-找质数与break">
            
                    
                    场景回顾 找质数与break
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2.4" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#break中断某个语句块">
            
                    
                    break中断某个语句块
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#continue-语句">
            
                    
                    continue 语句
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.3.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#continue-和-break-小有不同">
            
                    
                    continue 和 break 小有不同
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.3.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#循环的标签与continue结合">
            
                    
                    循环的标签与continue结合
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6.4" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#return-语句">
            
                    
                    return 语句
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.5" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#特殊控制语句说明">
            
                    
                    特殊控制语句说明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法method">
            
                    
                    方法(method)
            
                </a>
            

            
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        <li class="chapter " data-level="1.6.6.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#什么是方法函数">
            
                    
                    什么是方法(函数)
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法的组成">
            
                    
                    方法的组成
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法的调用">
            
                    
                    方法的调用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6.4" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法无参无返回值的情况-void">
            
                    
                    方法无参无返回值的情况 void
            
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        </li>
    
        <li class="chapter " data-level="1.6.6.5" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#形参实参注意事项">
            
                    
                    形参实参注意事项
            
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        <li class="chapter " data-level="1.6.6.6" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法调用时发生了什么事情">
            
                    
                    方法调用时发生了什么事情
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6.7" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法的重载overload">
            
                    
                    方法的重载(overload)
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.7.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#重载的概念">
            
                    
                    重载的概念
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#重载的特点">
            
                    
                    重载的特点
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#形参和实参的兼容性匹配">
            
                    
                    形参和实参的兼容性匹配
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.4" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法签名到底签的是什么">
            
                    
                    方法签名到底签的是什么
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.5" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#重载的精准调用兼容度">
            
                    
                    重载的精准调用(兼容度)
            
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        </li>
    
        <li class="chapter " data-level="1.6.7.6" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#println源码为什么名字相同的时候才重载">
            
                    
                    println源码为什么名字相同的时候才重载
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.7" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#连环调还是独立方法好">
            
                    
                    连环调还是独立方法好
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7.8" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#功能弱的方法要不要干掉">
            
                    
                    功能弱的方法要不要干掉
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6.8" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法参数的传递">
            
                    
                    方法参数的传递
            
                </a>
            

            
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        <li class="chapter " data-level="1.6.9" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#重点!!方法调用的分析">
            
                    
                    (重点!!)方法调用的分析
            
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        <li class="chapter " data-level="1.6.9.1" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#方法执行时究竟是怎么执行的栈!">
            
                    
                    方法执行时究竟是怎么执行的栈!
            
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            </ul>
            
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        <li class="chapter " data-level="1.6.10" data-path="DAY05 回忆式笔记.html">
            
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                    练习
            
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                <a href="DAY05 回忆式笔记.html#练习1-for循环打印空心矩形">
            
                    
                    练习1 for循环打印空心矩形
            
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        <li class="chapter " data-level="1.6.10.2" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习2-break循环控制">
            
                    
                    练习2 break循环控制
            
                </a>
            

            
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        <li class="chapter " data-level="1.6.10.3" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习3-continue-整除控制">
            
                    
                    练习3 continue 整除控制
            
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        <li class="chapter " data-level="1.6.10.4" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习4-方法声明及其调用-add">
            
                    
                    练习4 方法声明及其调用 add
            
                </a>
            

            
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        <li class="chapter " data-level="1.6.10.5" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习5-调用方法打印矩形">
            
                    
                    练习5 调用方法打印矩形
            
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        </li>
    
        <li class="chapter " data-level="1.6.10.6" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习6-调用方法打印矩形及其周长">
            
                    
                    练习6 调用方法打印矩形及其周长
            
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        </li>
    
        <li class="chapter " data-level="1.6.10.7" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习7-判断哪个方法是重载">
            
                    
                    练习7 判断哪个方法是重载
            
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        </li>
    
        <li class="chapter " data-level="1.6.10.8" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习8-重载一个打印正方形的方法">
            
                    
                    练习8 重载一个打印正方形的方法
            
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        <li class="chapter " data-level="1.6.10.9" data-path="DAY05 回忆式笔记.html">
            
                <a href="DAY05 回忆式笔记.html#练习9-用连环调来打印矩形-并切换图形的图案">
            
                    
                    练习9 用连环调来打印矩形 并切换图形的图案
            
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                                <h1 id="day05-&#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;">DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;</h1>
<h2 id="&#x6B7B;&#x5FAA;&#x73AF;&#x95EE;&#x9898;">&#x6B7B;&#x5FAA;&#x73AF;&#x95EE;&#x9898;</h2>
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<p>&#x5728;<code>while</code>&#x8BED;&#x53E5;&#x4E2D;&#x7528;&#x5E38;&#x91CF;<code>ture</code>&#x6765;&#x5145;&#x5F53;&#x6761;&#x4EF6;&#x7684;&#x90FD;&#x662F;&#x6B7B;&#x5FAA;&#x73AF;.</p>
<pre><code class="lang-java"><span class="hljs-keyword">while</span>(<span class="hljs-number">1</span>==<span class="hljs-number">1</span>){
    System.out.println(<span class="hljs-string">&quot;****&quot;</span>);
}
System.out.println(<span class="hljs-string">&quot;after loop&quot;</span>);

<span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x8BED;&#x53E5;&#x5728;&#x7F16;&#x8BD1;&#x7684;&#x65F6;&#x5019;&#x4F1A;&#x62A5;&#x9519;</span>
<span class="hljs-comment">// &#x9519;&#x8BEF;:&#x65E0;&#x6CD5;&#x8BBF;&#x95EE;&#x7684;&#x8BED;&#x53E5;</span>
<span class="hljs-comment">// System.out.println(&quot;after loop&quot;);</span>
</code></pre>
<p><strong>&#x4E0A;&#x8FF0;&#x4EE3;&#x7801;&#x7684;&#x9519;&#x8BEF;&#x539F;&#x56E0;&#x4E0D;&#x5728;&#x5FAA;&#x73AF;&#x672C;&#x8EAB;, &#x800C;&#x662F;&#x5728;&#x4E8E;, &#x6B7B;&#x5FAA;&#x73AF;&#x540E;&#x7684;&#x4EE3;&#x7801;&#x6C38;&#x8FDC;&#x6267;&#x884C;&#x4E0D;&#x5230;</strong></p>
<h3 id="for&#x8BED;&#x53E5;&#x6B7B;&#x5FAA;&#x73AF;">for&#x8BED;&#x53E5;&#x6B7B;&#x5FAA;&#x73AF;</h3>
<pre><code class="lang-class">class
</code></pre>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825091650245.png" alt="image-20210825091650245"></p>
<h3 id="&#x50CF;&#x4F46;&#x4E0D;&#x662F;&#x6B7B;&#x5FAA;&#x73AF;">&#x50CF;&#x4F46;&#x4E0D;&#x662F;&#x6B7B;&#x5FAA;&#x73AF;</h3>
<p><strong>&#x4E0B;&#x5217;&#x4EE3;&#x7801; <code>i--</code> &#x662F;&#x6B7B;&#x5FAA;&#x73AF;&#x5417;</strong>?</p>
<pre><code class="lang-java"><span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>;i&lt;<span class="hljs-number">100</span>;i--){
    System.out.println(<span class="hljs-string">&quot;**&quot;</span>);
}
</code></pre>
<blockquote>
<p><code>i--</code>&#x4E0D;&#x662F;&#x6B7B;&#x5FAA;&#x73AF;, &#x8FD9;&#x91CC;&#x7684;<code>i</code>&#x662F;int&#x7C7B;&#x578B; &#x4F60;&#x4E00;&#x76F4;&#x51CF;&#x51CF;&#x5230;-30&#x591A;&#x4EBF;&#x7684;&#x6700;&#x5C0F;&#x503C;&#x65F6;, &#x518D; - 1 &#x5C31;&#x7F16;&#x7A0B;&#x4E86;&#x6B63;&#x6570;</p>
<p>i--&#x662F;&#x6B7B;&#x5FAA;&#x73AF;&#x5417;?</p>
<p>&#x4F60;&#x4E0D;&#x505C;&#x5730;&#x51CF;, &#x7B49;&#x5230;&#x6EA2;&#x51FA;&#x7684;&#x65F6;&#x5019;&#x5C31;&#x77AC;&#x95F4;&#x53D8;&#x6210;&#x6B63;&#x503C;&#x6700;&#x5927;&#x4E86;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825091847922.png" alt="image-20210825091847922"></p>
<h2 id="&#x5FAA;&#x73AF;&#x7684;&#x7279;&#x6B8A;&#x6D41;&#x7A0B;&#x63A7;&#x5236;">&#x5FAA;&#x73AF;&#x7684;&#x7279;&#x6B8A;&#x6D41;&#x7A0B;&#x63A7;&#x5236;</h2>
<h3 id="break-&#x8BED;&#x53E5;">break &#x8BED;&#x53E5;</h3>
<ul>
<li><code>break</code>&#x8BED;&#x53E5;&#x7528;&#x4E8E;&#x7EC8;&#x6B62;&#x67D0;&#x4E2A;&#x8BED;&#x53E5;&#x5757;&#x7684;&#x6267;&#x884C;</li>
</ul>
<pre><code class="lang-java">{ ... ...
    <span class="hljs-keyword">break</span>;
 ... ...
}
</code></pre>
<ul>
<li><code>break</code>&#x8BED;&#x53E5;&#x51FA;&#x73B0;&#x5728;&#x591A;&#x5C42;&#x5D4C;&#x5957;&#x7684;&#x8BED;&#x53E5;&#x5757;&#x4E2D;&#x65F6;, &#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x6807;&#x7B7E;&#x4E4B;&#x660E;&#x8981;&#x7EC8;&#x6B62;&#x7684;&#x662F;&#x54EA;&#x4E00;&#x5C42;&#x8BED;&#x53E5;&#x5757;</li>
</ul>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825092029735.png" alt="image-20210825092029735"></p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825092217603.png" alt="image-20210825092217603"></p>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">LoopTest3</span></span>{
    <span class="hljs-comment">// break&#x53EF;&#x4EE5;&#x4E2D;&#x65AD;&#x5FAA;&#x73AF;&#x7684;&#x6267;&#x884C;</span>
    <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>;i&lt;<span class="hljs-number">10</span>;i++){
        System.out.println(<span class="hljs-string">&quot;i:&quot;</span>+i);
        <span class="hljs-keyword">if</span>(i==<span class="hljs-number">3</span>){
            <span class="hljs-keyword">break</span>;  <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x5FAA;&#x73AF;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x628A;&#x5FAA;&#x73AF;&#x76F4;&#x63A5;&#x641E;&#x6B7B;</span>
                    <span class="hljs-comment">// &#x53EF;&#x4EE5;&#x63D0;&#x524D;&#x628A;&#x5FAA;&#x73AF;&#x7834;&#x574F;&#x6389;</span>
        }
    }
    System.out.printlb(<span class="hljs-string">&quot;&#x5FAA;&#x73AF;&#x7ED3;&#x675F;&quot;</span>);
}
</code></pre>
<pre><code class="lang-java"><span class="hljs-comment">// &#x7EC8;&#x65AD;&#x79BB;&#x6211;&#x6700;&#x8FD1;&#x7684;&#x5FAA;&#x73AF;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">LoopTest4</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>;i&lt;<span class="hljs-number">5</span>;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j =<span class="hljs-number">0</span>;j&lt;<span class="hljs-number">3</span>;j++){
                System.out.ptintln(<span class="hljs-string">&quot;j:&quot;</span>+j);
                <span class="hljs-keyword">if</span>
            }
        }
    }
}
</code></pre>
<p>&#x540E;&#x9762;&#x7684;&#x5B66;&#x4E60;&#x4F1A;&#x7ECF;&#x5E38;&#x9047;&#x5230;&#x5C31;&#x8FD1;&#x539F;&#x5219;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825092803471.png" alt="image-20210825092803471"></p>
<h3 id="&#x5FAA;&#x73AF;&#x7684;&#x6807;&#x7B7E;&#x4E0E;break&#x8054;&#x5408;">&#x5FAA;&#x73AF;&#x7684;&#x6807;&#x7B7E;&#x4E0E;break&#x8054;&#x5408;</h3>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825093128323.png" alt="image-20210825093128323"></p>
<p>&#x5916;&#x5FAA;&#x73AF;&#x90FD;&#x5E72;&#x6B7B;&#x4E86;,&#x5185;&#x5FAA;&#x73AF;&#x5C31;&#x5FC5;&#x6B7B;&#x65E0;&#x7591;</p>
<h3 id="&#x573A;&#x666F;&#x56DE;&#x987E;-&#x627E;&#x8D28;&#x6570;&#x4E0E;break">&#x573A;&#x666F;&#x56DE;&#x987E; &#x627E;&#x8D28;&#x6570;&#x4E0E;break</h3>
<p>&#x627E;&#x8D28;&#x6570;&#x7684;&#x65F6;&#x5019;, &#x9047;&#x5230;&#x4E00;&#x4E2A;&#x53CD;&#x4F8B;&#x76F4;&#x63A5; break&#x5C31;&#x884C;&#x4E86;, &#x6CA1;&#x5FC5;&#x8981;&#x6D6A;&#x8D39;&#x64CD;&#x4F5C;&#x65F6;&#x95F4;&#x628A;&#x6240;&#x6709;&#x7684;&#x53EF;&#x80FD;&#x6027;&#x90FD;&#x5C1D;&#x8BD5;&#x4E00;&#x904D;.</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825093534728.png" alt="image-20210825093534728"></p>
<h3 id="break&#x4E2D;&#x65AD;&#x67D0;&#x4E2A;&#x8BED;&#x53E5;&#x5757;">break&#x4E2D;&#x65AD;&#x67D0;&#x4E2A;&#x8BED;&#x53E5;&#x5757;</h3>
<p>&#x533F;&#x540D;&#x5757;</p>
<p>&#x6CE8;&#x610F;&#x8FD9;&#x91CC;&#x5FC5;&#x987B;&#x5F97;&#x52A0;&#x6807;&#x7B7E; &#x5982;&#x679C;&#x4F60;&#x4E0D;&#x52A0;&#x6807;&#x7B7E;&#x5B9E;&#x4E0D;&#x884C;&#x7684;.</p>
<p>break&#x9ED8;&#x8BA4;&#x4E2D;&#x65AD;switch&#x6216;&#x8005;&#x5FAA;&#x73AF;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825100538491.png" alt="image-20210825100538491"></p>
<h2 id="continue-&#x8BED;&#x53E5;">continue &#x8BED;&#x53E5;</h2>
<p>continue &#x8BED;&#x53E5;&#x7528;&#x4E8E;&#x8DF3;&#x8FC7;&#x67D0;&#x4E2A;&#x5FAA;&#x73AF;&#x8BED;&#x53E5;&#x5757;&#x7684;<font color="red">&#x4E00;&#x6B21;</font>&#x6267;&#x884C;</p>
<p><code>continue</code>&#x8BED;&#x53E5;&#x51FA;&#x73B0;&#x5728;&#x591A;&#x5C42;&#x5D4C;&#x5957;&#x7684;&#x5FAA;&#x73AF;&#x8BED;&#x53E5;&#x4F53;&#x4E2D;&#x65F6;, &#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x6807;&#x7B7E;&#x6307;&#x660E;&#x8981;&#x8C03;&#x8FC7;&#x7684;&#x662F;&#x54EA;&#x4E00;&#x5C42;&#x5FAA;&#x73AF;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825100648618.png" alt="image-20210825100648618"></p>
<h3 id="continue-&#x548C;-break-&#x5C0F;&#x6709;&#x4E0D;&#x540C;">continue &#x548C; break &#x5C0F;&#x6709;&#x4E0D;&#x540C;</h3>
<ul>
<li><code>break</code>&#x53EF;&#x4EE5;&#x4E2D;&#x65AD;&#x5FAA;&#x73AF;&#x7684;&#x6267;&#x884C;, &#x4E2D;&#x65AD;&#x529B;&#x5EA6;&#x5927;, &#x4E5F;&#x53EF;&#x4EE5;&#x4E2D;&#x65AD;&#x67D0;&#x4E2A;&#x8BED;&#x53E5;&#x5757;&#x7684;&#x6267;&#x884C;, &#x5C31;&#x50CF;&#x4EA7;&#x751F;&#x4E00;&#x4E2A;&#x5927;&#x4E8B;&#x6545;</li>
<li><code>continue</code>&#x53EF;&#x4EE5;&#x4E2D;&#x65AD;&#x5FAA;&#x73AF;&#x7684;&#x67D0;&#x6B21;&#x6267;&#x884C;, &#x7EE7;&#x7EED;&#x8FDB;&#x5165;&#x4E0B;&#x4E00;&#x6B21;&#x6267;&#x884C;, &#x53EA;&#x9002;&#x7528;&#x4E8E;&#x5FAA;&#x73AF; &#x4E2D;&#x65AD;&#x529B;&#x5EA6;&#x5C0F;,&#x5C31;&#x50CF;&#x4EA7;&#x751F;&#x4E00;&#x4E2A;&#x5C0F;&#x4E8B;&#x6545;</li>
<li>brek&#x548C;continn</li>
</ul>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825101238373.png" alt="image-20210825101238373"></p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825101355066.png" alt="image-20210825101355066"></p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825101748395.png" alt="image-20210825101748395"></p>
<h3 id="&#x5FAA;&#x73AF;&#x7684;&#x6807;&#x7B7E;&#x4E0E;continue&#x7ED3;&#x5408;">&#x5FAA;&#x73AF;&#x7684;&#x6807;&#x7B7E;&#x4E0E;continue&#x7ED3;&#x5408;</h3>
<p>&#x5728;&#x5185;&#x5FAA;&#x73AF;&#x4E2D;&#x8DF3;&#x8FC7;&#x5916;&#x5FAA;&#x73AF;&#x7684;&#x5355;&#x6B21;&#x6267;&#x884C;</p>
<blockquote>
<p>&#x4E2D;&#x65AD;&#x6807;&#x7B7E;&#x6307;&#x793A;&#x7684;&#x5FAA;&#x73AF;&#x7684;&#x5F53;&#x6B64;, &#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x6807;&#x7B7E;&#x6307;&#x793A;&#x7684;&#x5FAA;&#x73AF;&#x7684;&#x4E0B;&#x4E00;&#x6B21;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825101844703.png" alt="image-20210825101844703"></p>
<h2 id="return-&#x8BED;&#x53E5;">return &#x8BED;&#x53E5;</h2>
<p><code>return</code>:&#x5E76;&#x975E;&#x4E13;&#x95E8;&#x7528;&#x4E8E;&#x7ED3;&#x675F;&#x5FAA;&#x73AF;&#x7684;, &#x5B83;&#x7684;&#x529F;&#x80FD;&#x5B9E;&#x7ED3;&#x675F;&#x4E00;&#x4E2A;&#x65B9;&#x6CD5;. &#x5F53;&#x4E00;&#x4E2A;&#x65B9;&#x6CD5;&#x6267;&#x884C;&#x5230;&#x4E00;&#x4E2A;return&#x8BED;&#x53E5;&#x65F6;, &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x5C06;&#x88AB;&#x7ED3;&#x675F;</p>
<p>&#x4E0E;break&#x548C;continue&#x4E0D;&#x540C;&#x7684;&#x662F;, return&#x76F4;&#x63A5;&#x7ED3;&#x675F;&#x6574;&#x4E2A;&#x65B9;&#x6CD5; , &#x4E0D;&#x7BA1;&#x8FD9;&#x4E2A;return&#x5904;&#x4E8E;&#x591A;&#x5C11;&#x5C42;&#x5FAA;&#x73AF;&#x4E4B;&#x5185;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825103249075.png" alt="image-20210825103249075"></p>
<h2 id="&#x7279;&#x6B8A;&#x63A7;&#x5236;&#x8BED;&#x53E5;&#x8BF4;&#x660E;">&#x7279;&#x6B8A;&#x63A7;&#x5236;&#x8BED;&#x53E5;&#x8BF4;&#x660E;</h2>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825103535140.png" alt="image-20210825103535140"></p>
<h2 id="&#x65B9;&#x6CD5;method">&#x65B9;&#x6CD5;(method)</h2>
<h3 id="&#x4EC0;&#x4E48;&#x662F;&#x65B9;&#x6CD5;&#x51FD;&#x6570;">&#x4EC0;&#x4E48;&#x662F;&#x65B9;&#x6CD5;(&#x51FD;&#x6570;)?</h3>
<ul>
<li>&#x65B9;&#x6CD5;&#x662F;&#x7C7B;&#x6216;&#x5BF9;&#x8C61;&#x884C;&#x4E3A;&#x7279;&#x5F81;&#x7684;&#x62BD;&#x8C61;, &#x4E5F;&#x6210;&#x4E3A;&#x51FD;&#x6570;</li>
<li>java&#x91CC;&#x7684;&#x65B9;&#x6CD5;&#x4E0D;&#x80FD;&#x72EC;&#x7ACB;&#x5B58;&#x5728;,&#x6240;&#x6709;&#x7684;&#x65B9;&#x6CD5;&#x5FC5;&#x987B;&#x5B9A;&#x4E49;&#x5728;&#x7C7B;&#x91CC;. &#x4E14;&#x65B9;&#x6CD5;&#x4E0D;&#x53EF;&#x4EE5;&#x5D4C;&#x5957;</li>
</ul>
<blockquote>
<p>&#x51FD;&#x6570;&#x5C31;&#x50CF;&#x4E00;&#x4E2A;&#x9ED1;&#x5323;&#x5B50;, &#x6211;&#x5F80;&#x91CC;&#x9762;&#x653E;&#x5165;&#x4E00;&#x4E9B;&#x4E1C;&#x897F; &#x5B83;&#x5C31;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E9B;&#x4E1C;&#x897F;&#x7ED9;&#x6211;</p>
<p>&#x5C31;&#x50CF;&#x662F;&#x4E00;&#x4E2A;&#x9762;&#x5305;&#x673A;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825103621643.png" alt="image-20210825103621643"></p>
<p><strong>&#x5F62;&#x53C2;</strong>: &#x5F62;&#x5F0F;&#x4E0A;&#x6709;&#x8FD9;&#x4E48;&#x4E00;&#x4E2A;&#x6570;, &#x4F46;&#x662F;&#x76EE;&#x524D;&#x5B9E;&#x9645;&#x662F;&#x591A;&#x5C11;&#x6211;&#x8FD8;&#x4E0D;&#x77E5;&#x9053;.</p>
<blockquote>
<p>&#x200B;    &#x6211;&#x7684;&#x8FD9;&#x4E2A;&#x529F;&#x80FD;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;,&#x76EE;&#x524D;&#x4E0D;&#x77E5;&#x9053;,&#x4F46;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x591A;&#x5C11;&#x4E0D;&#x4F1A;&#x5F71;&#x54CD;&#x6211;&#x7684;&#x53C2;&#x6570;.</p>
<p>&#x200B;    &#x5DE7;&#x5987;&#x96BE;&#x4E3A;&#x65E0;&#x7C73;&#x4E4B;&#x708A;</p>
</blockquote>
<p><em>&#x6211;&#x5728;&#x7528;&#x7684;&#x65F6;&#x5019;&#x4F1A;&#x7ED9;&#x5B83;&#x771F;&#x7684;&#x6570;&#x636E;, &#x4F46;&#x662F;&#x771F;&#x7684;&#x7ED9;&#x4E86;&#x6570;&#x636E;&#x4E4B;&#x540E;&#x5C31;&#x6362;&#x4E86;&#x53EB;&#x6CD5;,<strong>&#x5B9E;&#x53C2;</strong></em></p>
<p><strong>&#x5B9E;&#x53C2;</strong>: &#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x65F6;&#x5B9E;&#x9645;&#x4F20;&#x7ED9;&#x51FD;&#x6570;&#x5F62;&#x5F0F;&#x53C2;&#x6570;&#x7684;&#x6570;&#x636E;</p>
<blockquote>
<p>&#x5728;&#x6709;&#x4E9B;&#x8BED;&#x8A00;&#x4E2D; &#x65B9;&#x6CD5;&#x548C;&#x51FD;&#x6570;&#x662F;&#x5206;&#x5F00;&#x7684; </p>
<p>&#x5728;&#x90E8;&#x5206;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#x4E2D; &#x7BA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x53EB;&#x51FD;&#x6570; &#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x53EB;&#x65B9;&#x6CD5;</p>
<p>java&#x662F;&#x7EDF;&#x4E00;&#x7684;</p>
</blockquote>
<h3 id="&#x65B9;&#x6CD5;&#x7684;&#x7EC4;&#x6210;">&#x65B9;&#x6CD5;&#x7684;&#x7EC4;&#x6210;</h3>
<pre><code>&#x4FEE;&#x9970;&#x7B26; &#x8FD4;&#x56DE;&#x503C;&#x7C7B;&#x578B; &#x65B9;&#x6CD5;&#x540D; (&#x53C2;&#x6570;&#x7C7B;&#x578B;1 &#x5F62;&#x53C2;1,&#x53C2;&#x6570;&#x7C7B;&#x578B;2 &#x5F62;&#x53C2;2,...){
    &#x7A0B;&#x5E8F;&#x4EE3;&#x7801;;
    return &#x8FD4;&#x56DE;&#x503C;;
}
// &#x65B9;&#x6CD5;&#x4E4B;&#x95F4;&#x90FD;&#x662F;&#x5E73;&#x7EA7;&#x7684;,&#x65B9;&#x6CD5;&#x4E4B;&#x95F4;&#x4E0D;&#x5141;&#x8BB8;&#x5D4C;&#x5957; &#x4E00;&#x4E2A;&#x529F;&#x80FD;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x72EC;&#x7ACB;&#x7684;&#x529F;&#x80FD;
</code></pre><p><strong>&#x65B9;&#x6CD5;</strong>=&#x65B9;&#x6CD5;&#x7B7E;&#x540D;(&#x4E0D;&#x6267;&#x884C;) <font color="red"><code>API</code></font>+&#x65B9;&#x6CD5;&#x4F53;(&#x5B9E;&#x9645;&#x6267;&#x884C;)</p>
<p><strong>API</strong>: &#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x63A5;&#x53E3;</p>
<blockquote>
<p>&#x7B7E;&#x540D;&#x8868;&#x793A;&#x4E00;&#x4E2A;&#x6388;&#x6743;, &#x4E0D;&#x7B7E;&#x540D;&#x662F;&#x6CA1;&#x6CD5;&#x4F7F;&#x7528;&#x7684;</p>
</blockquote>
<p><strong>&#x8FD4;&#x56DE;&#x503C;&#x7C7B;&#x578B;</strong>: &#x65B9;&#x6CD5;&#x529F;&#x80FD;&#x7684;&#x6700;&#x7EC8;&#x6210;&#x679C;</p>
<p><strong>&#x65B9;&#x6CD5;&#x540D;:</strong> &#x6807;&#x8BC6;&#x7B26;</p>
<p><strong>&#x5F62;&#x5F0F;&#x53C2;&#x6570;:</strong> &#x65B9;&#x6CD5;&#x7684;&#x529F;&#x80FD;&#x6027;&#x9700;&#x8981;&#x7684;&#x6570;&#x636E;,&#x4F46;&#x662F;&#x6570;&#x636E;&#x7684;&#x5177;&#x4F53;&#x503C;&#x4E0D;&#x786E;&#x5B9A;, &#x4F46;&#x662F;&#x5B83;&#x7684;&#x503C;&#x662F;&#x591A;&#x5C11;&#x5176;&#x5B9E;&#x4E5F;&#x4E0D;&#x5F71;&#x54CD;&#x529F;&#x80FD;.</p>
<p><strong>&#x8FD4;&#x56DE;&#x503C;:</strong> &#x65B9;&#x6CD5;&#x6267;&#x884C;&#x5B8C;&#x6BD5;&#x540E;&#x7684;&#x6210;&#x679C;&#x6570;&#x636E;,&#x8FD4;&#x56DE;&#x7ED9;&#x4F7F;&#x7528;&#x8005;.</p>
<pre><code class="lang-java"><span class="hljs-comment">// &#x793A;&#x4F8B;</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MethodTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">add</span><span class="hljs-params">(<span class="hljs-keyword">int</span> a, <span class="hljs-keyword">int</span> b)</span></span>{
        <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x4E0D;&#x4F1A;&#x6267;&#x884C; &#x4EE5;&#x4E3A;&#x5B83;&#x4E0D;&#x662F;&#x5165;&#x53E3;&#x65B9;&#x6CD5;main</span>
        System.out.println(<span class="hljs-string">&quot;add()...&quot;</span>);
        <span class="hljs-keyword">int</span> c = a + b;
        <span class="hljs-keyword">return</span> c;
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        System.out.println(<span class="hljs-string">&quot;main start&quot;</span>);
        System.out.println(<span class="hljs-string">&quot;main end&quot;</span>);
    }
}
</code></pre>
<h3 id="&#x65B9;&#x6CD5;&#x7684;&#x8C03;&#x7528;">&#x65B9;&#x6CD5;&#x7684;&#x8C03;&#x7528;</h3>
<blockquote>
<p>&#x65B9;&#x6CD5;&#x53EA;&#x6709;&#x88AB;&#x8C03;&#x7528;(invoke)&#x624D;&#x6267;&#x884C;</p>
<p>&#x200B;    &#x65B9;&#x6CD5;&#x540D;(&#x5B9E;&#x9645;&#x53C2;&#x6570;&#x5217;&#x8868;); &#x5FC5;&#x987B;&#x5B8C;&#x5168;&#x6309;&#x7167;&#x5F62;&#x53C2;&#x8981;&#x6C42;&#x5199;</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MethodTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">add</span><span class="hljs-params">(<span class="hljs-keyword">int</span> a, <span class="hljs-keyword">int</span> b)</span></span>{
        <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x4E0D;&#x4F1A;&#x6267;&#x884C; &#x4EE5;&#x4E3A;&#x5B83;&#x4E0D;&#x662F;&#x5165;&#x53E3;&#x65B9;&#x6CD5;main</span>
        System.out.println(<span class="hljs-string">&quot;add()...&quot;</span>);
        <span class="hljs-keyword">int</span> c = a + b;
        <span class="hljs-keyword">return</span> c;  <span class="hljs-comment">// &#x8FD9;&#x4E2A;c&#x4F60;&#x5728;main&#x91CC;&#x9762;&#x5C31;&#x8BBF;&#x95EE;&#x4E0D;&#x4E86; &#x800C;&#x4E14;&#x6267;&#x884C;&#x7684;&#x65F6;&#x5019; &#x65B9;&#x6CD5;&#x4E00;&#x65E6;&#x7ED3;&#x675F; c&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#x5C31;&#x4E5F;&#x6B7B;&#x4E86;</span>
    }                <span class="hljs-comment">// &#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5FC5;&#x987B;&#x8981;&#x501F;&#x52A9;&#x4E00;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4; &#x6211;&#x8981;&#x628A;&#x8FD9;&#x4E2A;&#x8FD4;&#x56DE;&#x7684;&#x503C;&#x653E;&#x5230;&#x4E00;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4;&#x540E;</span>
                    <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x624D;&#x4F1A;&#x771F;&#x7684;&#x6B7B;</span>
                    <span class="hljs-comment">// &#x90A3;&#x4E48;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5728;&#x54EA;? &#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5C31;&#x662F;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x672C;&#x8EAB;</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        System.out.println(<span class="hljs-string">&quot;main start&quot;</span>);
        <span class="hljs-keyword">int</span> result = add(<span class="hljs-number">10</span>,<span class="hljs-number">30</span>);          <span class="hljs-comment">// &#x5FC5;&#x987B;&#x5728;&#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x63A5;&#x6536; &#x53EA;&#x6709;&#x4E00;&#x6B21;&#x673A;&#x4F1A;</span>
        <span class="hljs-comment">// &#x53D8;&#x91CF;=&#x65B9;&#x6CD5;&#x8C03;&#x7528;                    // &#x5982;&#x679C;&#x4E0D;&#x63A5;&#x53D7; &#x8FD9;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4;&#x5C31;&#x6CA1;&#x4E86; &#x518D;&#x63A5;&#x6536;&#x4E0D;&#x5230;&#x4E86;</span>
        System.out.println(result);
        System.out.println(<span class="hljs-string">&quot;main end&quot;</span>);
    }
}
</code></pre>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825113840841.png" alt="image-20210825113840841"></p>
<h3 id="&#x65B9;&#x6CD5;&#x65E0;&#x53C2;&#x65E0;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x60C5;&#x51B5;-void">&#x65B9;&#x6CD5;&#x65E0;&#x53C2;&#x65E0;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x60C5;&#x51B5; void</h3>
<blockquote>
<p>&#x65E0;&#x53C2;&#x65E0;&#x8FD4;&#x56DE;&#x662F;&#x65B9;&#x6CD5;&#x4E2D;&#x6700;&#x7B80;&#x5355;&#x7684;&#x5F62;&#x5F0F;</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">test</span><span class="hljs-params">()</span></span>{
    System.out.println(<span class="hljs-string">&quot;test()... &quot;</span>);
    <span class="hljs-keyword">return</span>; <span class="hljs-comment">// &#x5F53;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x7C7B;&#x578B;&#x4E3A;void&#x65F6;, return&#x5E76;&#x4E14;&#x662F;&#x518D;&#x6700;&#x540E;&#x65F6;,&#x53EF;&#x4EE5;&#x7701;&#x7565;return</span>
}

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
    test(); <span class="hljs-comment">// &#x5373;&#x4F7F;&#x4E0D;&#x4F20;&#x5165;&#x5B9E;&#x53C2;, &#x4E5F;&#x4E0D;&#x80FD;&#x7701;&#x7565;(),&#x6240;&#x4EE5;()&#x662F;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x7684;&#x6807;&#x5FD7;</span>
    <span class="hljs-comment">// int y = test()  &#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x65F6; &#x7981;&#x6B62;&#x63A5;&#x6536;</span>
    <span class="hljs-comment">// &#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x65F6;, &#x7981;&#x6B62;&#x63A5;&#x6536;</span>
    <span class="hljs-comment">// System.out.println(test()); &#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x65F6;&#x4E0D;&#x8981;&#x4F46;&#x56E0;,&#x56E0;&#x4E3A;&#x6CA1;&#x6709;&#x53EF;&#x6253;&#x5370;&#x7684;&#x5185;&#x5BB9;</span>

}
</code></pre>
<h3 id="&#x5F62;&#x53C2;&#x5B9E;&#x53C2;&#x6CE8;&#x610F;&#x4E8B;&#x9879;">&#x5F62;&#x53C2;&#x5B9E;&#x53C2;&#x6CE8;&#x610F;&#x4E8B;&#x9879;</h3>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825143653702.png" alt="image-20210825143653702"></p>
<ol>
<li>&#x5B9E;&#x53C2;&#x5411;&#x5F62;&#x53C2;&#x7684;&#x4F20;&#x9012;&#x5176;&#x5B9E;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x8D4B;&#x503C;&#x8FC7;&#x7A0B;, &#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x53EA;&#x8981;&#x6EE1;&#x8DB3;&#x8D4B;&#x503C;&#x7684;&#x517C;&#x5BB9;&#x6027;&#x5373;&#x53EF;</li>
</ol>
<blockquote>
<p>return&#x7684;&#x8FC7;&#x7A0B;&#x4E5F;&#x4E00;&#x6837; return&#x4E2D;&#x7684;&#x503C;&#x80FD;&#x591F;&#x88AB;&#x517C;&#x5BB9;&#x5373;&#x53EF;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825144050223.png" alt="image-20210825144050223"></p>
<h3 id="&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x65F6;&#x53D1;&#x751F;&#x4E86;&#x4EC0;&#x4E48;&#x4E8B;&#x60C5;">&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x65F6;&#x53D1;&#x751F;&#x4E86;&#x4EC0;&#x4E48;&#x4E8B;&#x60C5;</h3>
<ol>
<li>&#x5B9E;&#x53C2;&#x7ED9;&#x5F62;&#x53C2;&#x8D4B;&#x503C;</li>
<li>&#x5F53;&#x524D;&#x7684;&#x8C03;&#x7528;&#x8005;&#x65B9;&#x6CD5;&#x5F00;&#x542F;&#x4E00;&#x4E2A;&#x73B0;&#x573A;&#x4FDD;&#x62A4;, <strong>&#x5F53;&#x524D;&#x65B9;&#x6CD5;&#x6302;&#x8D77;</strong></li>
<li><font color="red">&#x88AB;&#x8C03;&#x7528;&#x65B9;&#x6CD5;</font>&#x5F00;&#x59CB;&#x6267;&#x884C;</li>
<li><font color="red">&#x88AB;&#x8C03;&#x7528;&#x65B9;&#x6CD5;</font>&#x7ED3;&#x675F;&#x540E; &#x56DE;&#x5230;&#x8C03;&#x7528;&#x8005;&#x65B9;&#x6CD5;&#x73B0;&#x573A; &#x73B0;&#x573A;&#x56DE;&#x590D;</li>
<li>&#x7EE7;&#x7EED;&#x6267;&#x884C;&#x8C03;&#x7528;&#x8005;&#x65B9;&#x6CD5;</li>
<li><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825145234252.png" alt="image-20210825145234252"></li>
</ol>
<blockquote>
<p>&#x6240;&#x4EE5;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x662F;&#x7531;&#x98CE;&#x9669;&#x7684;, &#x6211;&#x4E0D;&#x77E5;&#x9053;&#x88AB;&#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x4EC0;&#x4E48;&#x65F6;&#x5019;&#x7ED3;&#x675F;</p>
<p>&#x5B83;&#x628A;&#x6D41;&#x7A0B;&#x7684;&#x638C;&#x63A7;&#x6743;&#x4EA4;&#x7ED9;&#x4E86;&#x88AB;&#x8C03;&#x7528;&#x65B9;&#x6CD5;</p>
<p><strong>&#x5C3D;&#x91CF;&#x5728;&#x65B9;&#x6CD5;&#x4E2D;&#x5C11;&#x7528;&#x6B7B;&#x5FAA;&#x73AF; &#x4EE5;&#x514D;&#x8C03;&#x7528;&#x4E4B;&#x540E;&#x56DE;&#x4E0D;&#x6765;</strong></p>
<p><strong>&#x800C;&#x4E14;&#x8FD8;&#x8981;&#x907F;&#x514D;<font color="red">&#x4E92;&#x76F8;&#x8C03;&#x7528;</font></strong>,&#x4EE5;&#x514D;&#x4EA7;&#x751F;&#x65E0;&#x9650;&#x7684;&#x9012;&#x5F52;&#x8C03;&#x7528;</p>
</blockquote>
<h2 id="&#x65B9;&#x6CD5;&#x7684;&#x91CD;&#x8F7D;overload">&#x65B9;&#x6CD5;&#x7684;&#x91CD;&#x8F7D;(overload)</h2>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825151048540.png" alt="image-20210825151048540"></p>
<h3 id="&#x91CD;&#x8F7D;&#x7684;&#x6982;&#x5FF5;">&#x91CD;&#x8F7D;&#x7684;&#x6982;&#x5FF5;</h3>
<p>&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x7C7B;&#x4E2D;,&#x5141;&#x8BB8;&#x7EAF;&#x5728;&#x4E00;&#x4E2A;&#x4EE5;&#x4E0A;&#x7684;&#x540C;&#x540D;&#x65B9;&#x6CD5;, &#x53EA;&#x8981;&#x5B83;&#x4EEC;&#x7684;&#x53C2;&#x6570;&#x4E2A;&#x6570;&#x6216;&#x8005;&#x53C2;&#x6570;&#x7C7B;&#x578B;&#x4E0D;&#x540C;&#x5373;&#x53EF;.</p>
<h3 id="&#x91CD;&#x8F7D;&#x7684;&#x7279;&#x70B9;">&#x91CD;&#x8F7D;&#x7684;&#x7279;&#x70B9;</h3>
<p>&#x4E0E;&#x8FD4;&#x56DE;&#x7C7B;&#x578B;&#x65E0;&#x5173;,&#x53EA;&#x770B;&#x53C2;&#x6570;&#x5217;&#x8868;,&#x4E14;&#x53C2;&#x6570;&#x5217;&#x8868;&#x5FC5;&#x987B;&#x4E0D;&#x540C;.(&#x53C2;&#x6570;&#x4E2A;&#x6570;&#x6216;&#x53C2;&#x6570;&#x7C7B;&#x578B;). &#x8C03;&#x7528;&#x65F6;,&#x6839;&#x636E;&#x65B9;&#x6CD5;&#x53C2;&#x6570;&#x5217;&#x8868;&#x7684;&#x4E0D;&#x540C;&#x6765;&#x533A;&#x522B;.</p>
<blockquote>
<p>&#x4E0D;&#x540C;&#x5305;&#x62EC;</p>
<p>&#x200B;    &#x53C2;&#x6570;&#x7C7B;&#x578B;&#x4E0D;&#x540C;, &#x4E2A;&#x6570;&#x4E0D;&#x540C;, &#x987A;&#x5E8F;&#x4E0D;&#x540C;</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">OverLoadTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{

    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">add</span><span class="hljs-params">(<span class="hljs-keyword">int</span> a,<span class="hljs-keyword">int</span> b)</span></span>{

    }
}
</code></pre>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825151721484.png" alt="image-20210825151721484"></p>
<h3 id="&#x5F62;&#x53C2;&#x548C;&#x5B9E;&#x53C2;&#x7684;&#x517C;&#x5BB9;&#x6027;&#x5339;&#x914D;">&#x5F62;&#x53C2;&#x548C;&#x5B9E;&#x53C2;&#x7684;&#x517C;&#x5BB9;&#x6027;&#x5339;&#x914D;</h3>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825151822811.png" alt="image-20210825151822811"></p>
<p>&#x91CD;&#x8F7D;&#x65B9;&#x6CD5;&#x5728;&#x8C03;&#x7528;&#x65F6;, &#x5F62;&#x53C2;&#x548C;&#x5B9E;&#x53C2;&#x7684;&#x5339;&#x914D;&#x662F;&#x6709;&#x517C;&#x5BB9;&#x5EA6;&#x7684;</p>
<p>&#x4F18;&#x5148;&#x7CBE;&#x51C6;&#x5339;&#x914D;, &#x5982;&#x679C;&#x4E0D;&#x80FD;&#x7CBE;&#x51C6;&#x5339;&#x914D;&#x518D;&#x517C;&#x5BB9;&#x5339;&#x914D;</p>
<h3 id="&#x65B9;&#x6CD5;&#x7B7E;&#x540D;&#x5230;&#x5E95;&#x7B7E;&#x7684;&#x662F;&#x4EC0;&#x4E48;">&#x65B9;&#x6CD5;&#x7B7E;&#x540D;&#x5230;&#x5E95;&#x7B7E;&#x7684;&#x662F;&#x4EC0;&#x4E48;</h3>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825152214245.png" alt="image-20210825152214245"></p>
<p>&#x65B9;&#x6CD5;&#x7B7E;&#x540D;&#x66F4;&#x770B;&#x91CD;&#x7C7B;&#x578B; &#x53C2;&#x6570;&#x540D;&#x53EB;&#x4EC0;&#x4E48;&#x5E76;&#x4E0D;&#x91CD;&#x8981;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825152302642.png" alt="image-20210825152302642"></p>
<h3 id="&#x91CD;&#x8F7D;&#x7684;&#x7CBE;&#x51C6;&#x8C03;&#x7528;&#x517C;&#x5BB9;&#x5EA6;">&#x91CD;&#x8F7D;&#x7684;&#x7CBE;&#x51C6;&#x8C03;&#x7528;(&#x517C;&#x5BB9;&#x5EA6;)</h3>
<blockquote>
<p>&#x517C;&#x5BB9;&#x5EA6;&#x76F8;&#x540C;&#x7684;&#x65F6;&#x5019;, &#x6709;&#x53EF;&#x80FD;&#x51FA;&#x73B0;&#x517C;&#x5BB9;&#x5EA6;&#x65E0;&#x6CD5;&#x53D6;&#x820D;&#x7684;&#x72B6;&#x51B5; &#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x4F1A;&#x76F4;&#x63A5;&#x62A5;&#x9519;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825152627783.png" alt="image-20210825152627783"></p>
<h3 id="println&#x6E90;&#x7801;&#x4E3A;&#x4EC0;&#x4E48;&#x540D;&#x5B57;&#x76F8;&#x540C;&#x7684;&#x65F6;&#x5019;&#x624D;&#x91CD;&#x8F7D;">println&#x6E90;&#x7801;?&#x4E3A;&#x4EC0;&#x4E48;&#x540D;&#x5B57;&#x76F8;&#x540C;&#x7684;&#x65F6;&#x5019;&#x624D;&#x91CD;&#x8F7D;?</h3>
<p>&#x65B9;&#x6CD5;&#x540D;&#x76F8;&#x540C;&#x5176;&#x5B9E;&#x8868;&#x547D;&#x4E86;&#x65B9;&#x6CD5;&#x7684;&#x529F;&#x80FD;&#x662F;&#x76F8;&#x8FD1;&#x7684;.</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825152954772.png" alt="image-20210825152954772"></p>
<p>&#x4E0D;&#x662F;<code>println</code>&#x5F88;&#x5F3A;, &#x800C;&#x662F;&#x5B83;&#x91CD;&#x8F7D;&#x4E86;&#x8DB3;&#x591F;&#x591A;&#x7684;&#x65B9;&#x6CD5;</p>
<p><strong>&#x91CD;&#x8F7D;&#x7684;&#x610F;&#x4E49;</strong>:</p>
<p>&#x65B9;&#x6CD5;&#x91CD;&#x8F7D;&#x7684;&#x76EE;&#x7684;&#x662F; &#x8BA9;&#x8C03;&#x7528;&#x8005;&#x4EE5;&#x4E3A;&#x65B9;&#x6CD5;&#x5F88;&#x5389;&#x5BB3;,&#x7B80;&#x5316;&#x8BB0;&#x5FC6;,&#x53EA;&#x9700;&#x8BB0;&#x4F4F;&#x4E00;&#x4E2A;&#x540D;&#x5B57;&#x5C31;&#x884C;&#x4E86;</p>
<blockquote>
<p>&#x5982;&#x679C;&#x6211;&#x662F;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x8BBE;&#x8BA1;&#x8005;,&#x6211;&#x4E00;&#x5B9A;&#x4F1A;&#x8BA9;&#x5B83;&#x5C3D;&#x91CF;&#x591A;&#x7684;&#x91CD;&#x8F7D;</p>
</blockquote>
<h3 id="&#x8FDE;&#x73AF;&#x8C03;&#x8FD8;&#x662F;&#x72EC;&#x7ACB;&#x65B9;&#x6CD5;&#x597D;">&#x8FDE;&#x73AF;&#x8C03;&#x8FD8;&#x662F;&#x72EC;&#x7ACB;&#x65B9;&#x6CD5;&#x597D;?</h3>
<blockquote>
<p>&#x8FDE;&#x73AF;&#x8C03;&#x597D;!!</p>
<p>&#x8FDE;&#x73AF;&#x8C03;&#x5C31;&#x975E;&#x5E38;&#x7684;&#x5BB9;&#x6613;&#x7EF4;&#x62A4;, &#x5982;&#x679C;&#x72EC;&#x7ACB;&#x7684;&#x5199; &#x4E00;&#x4E2A;&#x529F;&#x80FD;&#x8981;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x4F60;&#x5C31;&#x8981;&#x91CD;&#x65B0;&#x5B9E;&#x73B0;&#x5F88;&#x591A;&#x5F88;&#x591A;&#x6B21;</p>
</blockquote>
<p>&#x8FD9;&#x6837;&#x6211;&#x4EEC;&#x53EA;&#x8981;&#x6539;&#x4E00;&#x5904;, &#x591A;&#x4E2A;&#x65B9;&#x6CD5;&#x5C31;&#x4F1A;&#x88AB;&#x66F4;&#x6539;, &#x5F70;&#x663E;&#x4E86;&#x7F16;&#x7A0B;&#x7684;&#x52A8;&#x6001;&#x6027;</p>
<pre><code class="lang-java">he
</code></pre>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825161402099.png" alt="image-20210825161402099"></p>
<h3 id="&#x529F;&#x80FD;&#x5F31;&#x7684;&#x65B9;&#x6CD5;&#x8981;&#x4E0D;&#x8981;&#x5E72;&#x6389;">&#x529F;&#x80FD;&#x5F31;&#x7684;&#x65B9;&#x6CD5;&#x8981;&#x4E0D;&#x8981;&#x5E72;&#x6389;?</h3>
<blockquote>
<p>&#x4E0D;&#x8981; &#x5B83;&#x6709;&#x4E00;&#x4E2A;&#x4F18;&#x70B9; &#x5C31;&#x662F; &#x65E0;&#x53C2;</p>
</blockquote>
<p>&#x8C03;&#x7528;&#x4E00;&#x65E6;&#x6D89;&#x53CA;&#x5230;&#x53C2;&#x6570;,&#x5B83;&#x5C31;&#x4E00;&#x5B9A;&#x662F;&#x590D;&#x6742;&#x7684;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825162619715.png" alt="image-20210825162619715"></p>
<p><strong>&#x8FD9;&#x4E2A;&#x529F;&#x80FD;&#x8C03;&#x7528;&#x590D;&#x6742;, &#x4F46;&#x662F;&#x529F;&#x80FD;&#x5F3A;&#x5927;, &#x4E5F;&#x8981;&#x4FDD;&#x7559;</strong>. </p>
<p><strong>&#x6CE8;&#x610F;</strong>: &#x9762;&#x5BF9;&#x4E0D;&#x540C;&#x7684;&#x7528;&#x6237;&#x7FA4;</p>
<blockquote>
<p>&#x6709;&#x7684;&#x4EBA;&#x5C31;&#x662F;&#x559C;&#x6B22;&#x7528;&#x529F;&#x80FD;&#x7B80;&#x5355;&#x7684;,&#x6BD4;&#x5982;&#x624B;&#x673A;&#x6211;&#x80FD;&#x6253;&#x4E2A;&#x7535;&#x8BDD;&#x5C31;&#x884C;, &#x4F46;&#x6709;&#x7684;&#x4EBA;&#x5C31;&#x662F;&#x60F3;&#x5F04;&#x4E2A;root &#x7528;&#x4E00;&#x4E9B;&#x9AD8;&#x7EA7;&#x529F;&#x80FD;</p>
<p><strong>&#x6240;&#x4EE5;,&#x4ED6;&#x4EEC;&#x867D;&#x7136;&#x4E0D;&#x540C; &#x4F46;&#x662F;&#x90FD;&#x8981;&#x4FDD;&#x7559;</strong></p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825162800855.png" alt="image-20210825162800855"></p>
<h2 id="&#x65B9;&#x6CD5;&#x53C2;&#x6570;&#x7684;&#x4F20;&#x9012;">&#x65B9;&#x6CD5;&#x53C2;&#x6570;&#x7684;&#x4F20;&#x9012;</h2>
<p>java&#x91CC;&#x9762;&#x6CA1;&#x90A3;&#x4E48;&#x591A;&#x82B1;&#x91CC;&#x80E1;&#x54E8;&#x7684;,&#x5C31;&#x662F;&#x590D;&#x5236;&#x54C1; &#x800C;&#x53C2;&#x6570;&#x672C;&#x8EAB;&#x4E0D;&#x53D7;&#x5F71;&#x54CD;</p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825163038623.png" alt="image-20210825163038623"></p>
<h2 id="&#x91CD;&#x70B9;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x7684;&#x5206;&#x6790;">(&#x91CD;&#x70B9;!!)&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x7684;&#x5206;&#x6790;</h2>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825163308934.png" alt="image-20210825163308934"></p>
<h3 id="&#x65B9;&#x6CD5;&#x6267;&#x884C;&#x65F6;&#x7A76;&#x7ADF;&#x662F;&#x600E;&#x4E48;&#x6267;&#x884C;&#x7684;&#x6808;">&#x65B9;&#x6CD5;&#x6267;&#x884C;&#x65F6;&#x7A76;&#x7ADF;&#x662F;&#x600E;&#x4E48;&#x6267;&#x884C;&#x7684;?&#x6808;!</h3>
<p>&#x6808;&#x7684;&#x7279;&#x70B9;&#x5C31;&#x662F;&#x4E0A;&#x9762;&#x655E;&#x53E3;,&#x4E0B;&#x9762;&#x5C01;&#x6B7B;,&#x8FDB;&#x51FA;&#x90FD;&#x5728;&#x4E00;&#x4E2A;&#x53E3;</p>
<p><strong>&#x6240;&#x4EE5;, &#x5148;&#x8FDB;&#x540E;&#x51FA;,&#x540E;&#x8FDB;&#x5148;&#x51FA;</strong></p>
<blockquote>
<p>&#x5F39;&#x5323; &#x5B50;&#x5F39;&#x538B;&#x8FDB;&#x53BB; &#x6253;&#x51FA;&#x53BB; &#x4F60;&#x5148;&#x6253;&#x51FA;&#x53BB;&#x7684;&#x5B50;&#x5F39;&#x5C31;&#x662F;</p>
</blockquote>
<font color="red">&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x5B50;&#x5F39;, main&#x65B9;&#x6CD5;&#x662F;&#x7B2C;&#x4E00;&#x9897;&#x88AB;&#x538B;&#x8FDB;&#x53BB;&#x7684;&#x5B50;&#x5F39;,add&#x662F;&#x7B2C;&#x4E8C;&#x4E2A;&#x88AB;&#x538B;&#x8FDB;&#x53BB;&#x7684;&#x5B50;&#x5F39;,test&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x7B2C;&#x4E09;&#x9897;&#x5B50;&#x5F39;</font>

<p>&#x5904;&#x4E8E;&#x6D3B;&#x52A8;&#x72B6;&#x6001;&#x7684;&#x65B9;&#x6CD5;&#x6C38;&#x8FDC;&#x662F;&#x5728;&#x6808;&#x9876;&#x7684;&#x65B9;&#x6CD5;.</p>
<p><strong>&#x6267;&#x884C;&#x5B8C;&#x7684;&#x65B9;&#x6CD5;&#x4F1A;&#x5F39;&#x6808;</strong></p>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825164423018.png" alt="image-20210825164423018"></p>
<font color="red">**&#x5F53;&#x4E00;&#x4E2A;&#x6808;&#x7A7A;&#x7684;&#x65F6;&#x5019;,&#x5C31;&#x6CA1;&#x5F97;&#x73A9;&#x4E86;,&#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x8FDB;&#x7A0B;&#x7ED3;&#x675F;**</font>

<blockquote>
<p>&#x5BF9;&#x8FD9;&#x4E2A;&#x6570;&#x636E;&#x6D41;&#x662F;&#x8981;&#x5F7B;&#x5E95;&#x638C;&#x63E1;&#x7684;</p>
</blockquote>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/&#x52A8;&#x753B;&#x6539;&#x826F;.gif" alt="&#x52A8;&#x753B;&#x6539;&#x826F;"></p>
<h2 id="&#x7EC3;&#x4E60;">&#x7EC3;&#x4E60;</h2>
<h3 id="&#x7EC3;&#x4E60;1-for&#x5FAA;&#x73AF;&#x6253;&#x5370;&#x7A7A;&#x5FC3;&#x77E9;&#x5F62;">&#x7EC3;&#x4E60;1 for&#x5FAA;&#x73AF;&#x6253;&#x5370;&#x7A7A;&#x5FC3;&#x77E9;&#x5F62;</h3>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">PrintTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-keyword">int</span> hight = Integer.parseInt(agrs[<span class="hljs-number">0</span>]);
        <span class="hljs-keyword">int</span> width = Integer.parseInt(agrs[<span class="hljs-number">1</span>]);
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i&lt;hight;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j=<span class="hljs-number">0</span> ; j&lt;width;j++){
                <span class="hljs-keyword">if</span>(i == <span class="hljs-number">0</span> || i==hight-<span class="hljs-number">1</span>){
                    System.out.print(<span class="hljs-string">&quot;*&quot;</span>);
                }<span class="hljs-keyword">else</span>{
                    <span class="hljs-keyword">if</span>(j == <span class="hljs-number">0</span>||j==width-<span class="hljs-number">1</span>){
                        System.out.print(<span class="hljs-string">&quot;*&quot;</span>);
                    }<span class="hljs-keyword">else</span>{
                        System.out.print(<span class="hljs-string">&quot; &quot;</span>)
                    }
                }
            }
            System.out.println();
        }
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;2-break&#x5FAA;&#x73AF;&#x63A7;&#x5236;">&#x7EC3;&#x4E60;2 break&#x5FAA;&#x73AF;&#x63A7;&#x5236;</h3>
<p>&#x4ECE;&#x547D;&#x4EE4;&#x884C;&#x53C2;&#x6570;&#x83B7;&#x53D6;&#x4E00;&#x4E2A;n &#x4F7F;&#x5F97;&#x4E00;&#x4E2A;&#x672C;&#x6765;&#x5E94;&#x8BE5;&#x5FAA;&#x73AF;100&#x6B21;&#x7684;&#x5FAA;&#x73AF;,&#x8BA9;&#x5B83;&#x5B9E;&#x9645;&#x5FAA;&#x73AF;n&#x6B21;</p>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">LoopTest2</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-comment">// &#x9996;&#x5148;&#x662F;&#x83B7;&#x53D6;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;</span>
        <span class="hljs-keyword">int</span> n = Integer.parseInt(args[<span class="hljs-number">0</span>]);
        <span class="hljs-comment">// &#x4F7F;&#x7528;&#x4E09;&#x5143;&#x8FD0;&#x7B97;&#x7B26;,&#x5C06;n&#x548C;100&#x4E2D;&#x90A3;&#x4E2A;&#x8F83;&#x5927;&#x7684;&#x6570;&#x5F53;&#x4F5C;&#x5FAA;&#x73AF;&#x7684;&#x6761;&#x4EF6;</span>
        System.out.println(<span class="hljs-string">&quot;&#x672C;&#x6765;&#x5E94;&#x8BE5;&#x8FD0;&#x884C;&quot;</span>+(n&gt;<span class="hljs-number">100</span>?n:<span class="hljs-number">100</span>)+<span class="hljs-string">&quot;&#x6B21;&quot;</span>);
        <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>; i&lt;(n&gt;<span class="hljs-number">100</span>?n:<span class="hljs-number">100</span>);i++){
            System.out.println(<span class="hljs-string">&quot;&#x6211;&#x662F;&#x7B2C;&quot;</span>+(i+<span class="hljs-number">1</span>)+<span class="hljs-string">&quot;&#x6B21;&#x5FAA;&#x73AF;&quot;</span>);
            <span class="hljs-keyword">if</span> (i == n-<span class="hljs-number">1</span>){
                <span class="hljs-keyword">break</span>;
            }
        }
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;3-continue-&#x6574;&#x9664;&#x63A7;&#x5236;">&#x7EC3;&#x4E60;3 continue &#x6574;&#x9664;&#x63A7;&#x5236;</h3>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">LoopTest4</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-keyword">int</span> num = Integer.parseInt(args[<span class="hljs-number">0</span>]);
        <span class="hljs-keyword">int</span> mod = Integer.parseInt(args[<span class="hljs-number">1</span>]);
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>;i&lt;num;i++){
            <span class="hljs-keyword">if</span> (i%mod != <span class="hljs-number">0</span>){
                <span class="hljs-keyword">continue</span>;
            }
            System.out.println(i+<span class="hljs-string">&quot;&#x80FD;&#x591F;&#x88AB;&quot;</span>+mod+<span class="hljs-string">&quot;&#x6574;&#x9664;&quot;</span>);
        }
    }
}
</code></pre>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825102526573.png" alt="image-20210825102526573"></p>
<h3 id="&#x7EC3;&#x4E60;4-&#x65B9;&#x6CD5;&#x58F0;&#x660E;&#x53CA;&#x5176;&#x8C03;&#x7528;-add">&#x7EC3;&#x4E60;4 &#x65B9;&#x6CD5;&#x58F0;&#x660E;&#x53CA;&#x5176;&#x8C03;&#x7528; add</h3>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MethodTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">add</span><span class="hljs-params">(<span class="hljs-keyword">int</span> a, <span class="hljs-keyword">int</span> b)</span></span>{
        <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x4E0D;&#x4F1A;&#x6267;&#x884C; &#x4EE5;&#x4E3A;&#x5B83;&#x4E0D;&#x662F;&#x5165;&#x53E3;&#x65B9;&#x6CD5;main</span>
        System.out.println(<span class="hljs-string">&quot;add()...&quot;</span>);
        <span class="hljs-keyword">int</span> c = a + b;
        <span class="hljs-keyword">return</span> c;  <span class="hljs-comment">// &#x8FD9;&#x4E2A;c&#x4F60;&#x5728;main&#x91CC;&#x9762;&#x5C31;&#x8BBF;&#x95EE;&#x4E0D;&#x4E86; &#x800C;&#x4E14;&#x6267;&#x884C;&#x7684;&#x65F6;&#x5019; &#x65B9;&#x6CD5;&#x4E00;&#x65E6;&#x7ED3;&#x675F; c&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#x5C31;&#x4E5F;&#x6B7B;&#x4E86;</span>
    }                <span class="hljs-comment">// &#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5FC5;&#x987B;&#x8981;&#x501F;&#x52A9;&#x4E00;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4; &#x6211;&#x8981;&#x628A;&#x8FD9;&#x4E2A;&#x8FD4;&#x56DE;&#x7684;&#x503C;&#x653E;&#x5230;&#x4E00;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4;&#x540E;</span>
                    <span class="hljs-comment">// &#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x624D;&#x4F1A;&#x771F;&#x7684;&#x6B7B;</span>
                    <span class="hljs-comment">// &#x90A3;&#x4E48;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5728;&#x54EA;? &#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x5C31;&#x662F;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x672C;&#x8EAB;</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        System.out.println(<span class="hljs-string">&quot;main start&quot;</span>);
        <span class="hljs-keyword">int</span> result = add(<span class="hljs-number">10</span>,<span class="hljs-number">30</span>);          <span class="hljs-comment">// &#x5FC5;&#x987B;&#x5728;&#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x63A5;&#x6536; &#x53EA;&#x6709;&#x4E00;&#x6B21;&#x673A;&#x4F1A;</span>
        <span class="hljs-comment">// &#x53D8;&#x91CF;=&#x65B9;&#x6CD5;&#x8C03;&#x7528;                    // &#x5982;&#x679C;&#x4E0D;&#x63A5;&#x53D7; &#x8FD9;&#x4E2A;&#x4E34;&#x65F6;&#x7A7A;&#x95F4;&#x5C31;&#x6CA1;&#x4E86; &#x518D;&#x63A5;&#x6536;&#x4E0D;&#x5230;&#x4E86;</span>
        System.out.println(result);
        System.out.println(<span class="hljs-string">&quot;main end&quot;</span>);
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;5-&#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x6253;&#x5370;&#x77E9;&#x5F62;">&#x7EC3;&#x4E60;5 &#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x6253;&#x5370;&#x77E9;&#x5F62;</h3>
<blockquote>
<p>&#x7F16;&#x5199;&#x7A0B;&#x5E8F;, &#x58F0;&#x660E;&#x4E00;&#x4E2A;&#x7C7B;<code>TestMethod</code>, &#x5728;&#x5176;&#x4E2D;&#x58F0;&#x660E;&#x4E00;&#x4E2A;<code>method</code>&#x65B9;&#x6CD5;, &#x5728;&#x65B9;&#x6CD5;&#x4E2D;&#x6253;&#x5370;&#x4E00;&#x4E2A;<code>20*8</code>&#x7684;&#x77E9;&#x5F62;,&#x5728;<code>main</code>&#x65B9;&#x6CD5;&#x4E2D;&#x8C03;&#x7528;&#x8BE5;&#x65B9;&#x6CD5;.</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MethodTest</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-keyword">int</span> rows = Integer.parseInt(args[<span class="hljs-number">0</span>]);
        <span class="hljs-keyword">int</span> cols = Integer.parseInt(args[<span class="hljs-number">1</span>]);
        squarePrint(rows,cols);
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">squarePrint</span><span class="hljs-params">(<span class="hljs-keyword">int</span> rows,<span class="hljs-keyword">int</span> cols)</span></span>{
        <span class="hljs-comment">// &#x6253;&#x5370; rows*cols &#x7684;&#x77E9;&#x5F62;</span>
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i =<span class="hljs-number">0</span>;i&lt;rows;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j=<span class="hljs-number">0</span>;j&lt;cols;j++){
                System.out.print(<span class="hljs-string">&quot;*&quot;</span>);
            }
            System.out.println();
        }
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;6-&#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x6253;&#x5370;&#x77E9;&#x5F62;&#x53CA;&#x5176;&#x5468;&#x957F;">&#x7EC3;&#x4E60;6 &#x8C03;&#x7528;&#x65B9;&#x6CD5;&#x6253;&#x5370;&#x77E9;&#x5F62;&#x53CA;&#x5176;&#x5468;&#x957F;</h3>
<blockquote>
<p>&#x5728;&#x4E0A;&#x4E00;&#x4E2A;&#x7EC3;&#x4E60;&#x4E2D;&#x7684;TestMerthod&#x7C7B;&#x4E2D;&#x518D;&#x58F0;&#x660E;&#x4E00;&#x4E2A;&#x65B9;&#x6CD5;method1,&#x5728;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x4E2D;&#x6253;&#x5370;&#x4E00;&#x4E2A;n*m&#x7684;&#x77E9;&#x5F62;,&#x5E76;&#x5728;&#x65B9;&#x6CD5;&#x7ED3;&#x675F;&#x540E;&#x8FD4;&#x56DE;&#x77E9;&#x5F62;&#x7684;&#x5468;&#x957F;&#x5728;main&#x65B9;&#x6CD5;&#x4E2D;&#x8C03;&#x7528;&#x8BE5;&#x65B9;&#x6CD5;,&#x5E76;&#x6253;&#x5370;&#x5468;&#x957F;</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">TestMethod</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-comment">// &#x4ECE;&#x547D;&#x4EE4;&#x884C;&#x83B7;&#x53D6;&#x53C2;&#x6570;</span>
        <span class="hljs-keyword">int</span> rows = Integer.parseInt(args[<span class="hljs-number">0</span>]);
        <span class="hljs-keyword">int</span> cols = Integer.parseInt(args[<span class="hljs-number">1</span>]);
        <span class="hljs-comment">// &#x5B9A;&#x4E49;&#x4E00;&#x4E2A;int&#x53D8;&#x91CF;&#x6765;&#x63A5;&#x6536;&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x7684;&#x77E9;&#x5F62;&#x5468;&#x957F;</span>
        <span class="hljs-keyword">int</span> len = squarePrint(rows,cols);
        System.out.println(<span class="hljs-string">&quot;&#x8FD9;&#x4E2A;&#x77E9;&#x5F62;&#x7684;&#x5468;&#x957F;&#x4E3A;&quot;</span>+len);
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">squarePrint</span><span class="hljs-params">(<span class="hljs-keyword">int</span> rows,<span class="hljs-keyword">int</span> cols)</span></span>{
        <span class="hljs-comment">// &#x4E24;&#x5C42;&#x5FAA;&#x73AF;&#x6765;&#x6253;&#x5370;&#x8FD9;&#x4E2A;&#x77E9;&#x5F62;</span>
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>;i&lt;rows;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j=<span class="hljs-number">0</span>;j&lt;cols;j++){
                System.out.print(<span class="hljs-string">&quot;*&quot;</span>);
            }
            System.out.println();
        }
        <span class="hljs-comment">// &#x76F4;&#x63A5;&#x8BA1;&#x7B97;&#x5468;&#x957F; &#x7136;&#x540E;&#x628A;&#x5468;&#x957F;&#x8FD4;&#x56DE;</span>
        <span class="hljs-keyword">int</span> length = <span class="hljs-number">2</span>*(rows+cols);
        <span class="hljs-keyword">return</span> length;
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;7-&#x5224;&#x65AD;&#x54EA;&#x4E2A;&#x65B9;&#x6CD5;&#x662F;&#x91CD;&#x8F7D;">&#x7EC3;&#x4E60;7 &#x5224;&#x65AD;&#x54EA;&#x4E2A;&#x65B9;&#x6CD5;&#x662F;&#x91CD;&#x8F7D;</h3>
<p><img src="DAY05 &#x56DE;&#x5FC6;&#x5F0F;&#x7B14;&#x8BB0;.assets/image-20210825153734044.png" alt="image-20210825153734044"></p>
<h3 id="&#x7EC3;&#x4E60;8-&#x91CD;&#x8F7D;&#x4E00;&#x4E2A;&#x6253;&#x5370;&#x6B63;&#x65B9;&#x5F62;&#x7684;&#x65B9;&#x6CD5;">&#x7EC3;&#x4E60;8 &#x91CD;&#x8F7D;&#x4E00;&#x4E2A;&#x6253;&#x5370;&#x6B63;&#x65B9;&#x5F62;&#x7684;&#x65B9;&#x6CD5;</h3>
<blockquote>
<p>&#x5728;<code>TestMethod</code>&#x7C7B;&#x4E2D;&#x518D;&#x58F0;&#x660E;&#x4E00;&#x4E2A;&#x91CD;&#x8F7D;&#x65B9;&#x6CD5;<code>method1</code>, &#x5728;&#x65B9;&#x6CD5;&#x4E2D;&#x6253;&#x5370;&#x4E00;&#x4E2A;&#x8FB9;&#x957F;&#x4E3A;<code>n</code>&#x7684;&#x6B63;&#x65B9;&#x5F62;,&#x5E76;&#x518D;&#x65B9;&#x6CD5;&#x7ED3;&#x675F;&#x540E;&#x8FD4;&#x56DE;&#x6B63;&#x65B9;&#x5F62;&#x5468;&#x957F;,&#x5728;<code>main</code>&#x65B9;&#x6CD5;&#x4E2D;&#x8C03;&#x7528;&#x8BE5;&#x65B9;&#x6CD5;,&#x5E76;&#x6253;&#x5370;&#x5468;&#x957F;</p>
</blockquote>
<pre><code class="lang-java"><span class="hljs-comment">// &#x4F2A;&#x4EE3;&#x7801;</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">method1</span><span class="hljs-params">(<span class="hljs-keyword">int</span> n)</span></span>{
    <span class="hljs-comment">// &#x6253;&#x5370;&#x8FB9;&#x957F;&#x4E3A;n&#x7684;&#x6B63;&#x65B9;&#x5F62;</span>
}
</code></pre>
<pre><code class="lang-java"><span class="hljs-comment">// &#x5177;&#x4F53;&#x5B9E;&#x73B0;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">TestMethod</span></span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
        <span class="hljs-keyword">int</span> rows = Integer.parseInt(args[<span class="hljs-number">0</span>]);
        <span class="hljs-comment">// int cols = Integer.parseInt(args[1]);</span>
        <span class="hljs-keyword">int</span> len = method1(rows);
        System.out.println(<span class="hljs-string">&quot;&#x8FD9;&#x4E2A;&#x77E9;&#x5F62;&#x7684;&#x5468;&#x957F;&#x4E3A;&quot;</span>+len);
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">method1</span><span class="hljs-params">(<span class="hljs-keyword">int</span> rows,<span class="hljs-keyword">int</span> cols)</span></span>{
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>;i&lt;rows;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j=<span class="hljs-number">0</span>;j&lt;cols;j++){
                System.out.print(<span class="hljs-string">&quot;*&quot;</span>);
            }
            System.out.println();
        }
        <span class="hljs-keyword">int</span> length = <span class="hljs-number">2</span>*(rows+cols);
        <span class="hljs-keyword">return</span> length;
    }

    <span class="hljs-comment">// &#x91CD;&#x8F7D;&#x4E00;&#x4E2A;&#x6253;&#x5370;&#x6B63;&#x65B9;&#x5F62;&#x7684;&#x65B9;&#x6CD5;</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">method1</span><span class="hljs-params">(<span class="hljs-keyword">int</span> rows)</span></span>{
        <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>;i&lt;rows;i++){
            <span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j=<span class="hljs-number">0</span>;j&lt;rows;j++){
                System.out.print(<span class="hljs-string">&quot;* &quot;</span>);
            }
            System.out.println();
        }
        <span class="hljs-keyword">return</span>  <span class="hljs-number">4</span>*rows;
    }
}
</code></pre>
<h3 id="&#x7EC3;&#x4E60;9-&#x7528;&#x8FDE;&#x73AF;&#x8C03;&#x6765;&#x6253;&#x5370;&#x77E9;&#x5F62;-&#x5E76;&#x5207;&#x6362;&#x56FE;&#x5F62;&#x7684;&#x56FE;&#x6848;">&#x7EC3;&#x4E60;9 &#x7528;&#x8FDE;&#x73AF;&#x8C03;&#x6765;&#x6253;&#x5370;&#x77E9;&#x5F62; &#x5E76;&#x5207;&#x6362;&#x56FE;&#x5F62;&#x7684;&#x56FE;&#x6848;</h3>

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